| 摘要 |
PURPOSE:To prevent coarse particulate pollution and damage on the road surface by forming grooves or holed recesses which is reduced in depth when tyre pressure is increased in the internal face of a tyre and driving spike pins so as to come into contact with the groove or recessed parts. CONSTITUTION:When the tyre pressure is increased, the curvature of internal face 1 of the tyre is reduced and become averaged. The depth of a recessed part 2 is therefore reduced so that the top of a spike pin 3 driven into the layer 4 of a tread rubber is sucked into the surface 5 of the tread. On the contrary, when the tyre pressure is reduced, the top of said spike pin 3 projects from the surface 5 of the tread. By such constitution, the coarse particulate pollution and damage on the road face may be prevented.
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